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Trip discrimination method for pure electric power system

A technology of power system and identification method, which is applied to electrical components, emergency protection circuit devices, fault locations, etc., and can solve problems such as malfunction of stability control devices.

Inactive Publication Date: 2006-07-26
NR ELECTRIC CO LTD
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  • Abstract
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Problems solved by technology

[0012] Use the above method to judge tripping. Since the current and power may cross zero at the same time when the power system oscillates, when the power before the accident is greater than the threshold value and the oscillation period is long, it will be misjudged, and misjudgment may cause misoperation of the stability control device. , and lead to the implementation of stable control measures such as machine cutting and load shedding

Method used

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  • Trip discrimination method for pure electric power system
  • Trip discrimination method for pure electric power system
  • Trip discrimination method for pure electric power system

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Embodiment Construction

[0025] Such as figure 1 As shown, using the above criterion:

[0026] In order to ensure that the criterion can act reliably when there is no fault trip in the system; when the system oscillates, the output of the floating threshold is large enough, and the current variation does not act, so as to ensure that it will not be misjudged as a system trip; where: α = 0.8, β = 1 64 . Its implementation logic block diagram is as follows figure 1 shown. |ΔI| dt It is a floating value, which is a floating value at a certain oscillation frequency. The embodiment of the sudden change starting element of device of the present invention among the figure:

[0027] (1) Current mutation start

[0028] Δi=i k -i k-N

[0029] Distinguish by phase, if any phase satisfies the above formula for three consecutive times, the device will enter the starting state.

[0030] (2) Power mutation start

[0031] ΔP=P t -P...

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Abstract

This invention relates to electricity power system jump judging method, which adopts the following bases: A, protruding variables starting; b, )P-0.2Sí¦PS1 means front power larger than set value PSI; c, PtíœPS2, fault power smaller than set value PS2; d, three-phase current IíœIS1, current smaller than operation current; e, current variable satisfies the base larger than current float gate; f, tí¦tS1, determining the above data time lag, wherein the PSI smaller than transmission power value; PS2 is larger than zero and the maximum floating value with operation current IS1 larger than open circuit current; the UN is ratio voltage.

Description

1. Technical field [0001] The invention relates to a method for judging a trip of a power system, in particular to a method for judging a trip of a power system based on a pure electrical quantity using a floating threshold technology. 2. Background technology [0002] In recent years, my country's power grid has been in a period of rapid development. By the end of 2004, my country's total installed capacity had reached 440GW, and it is expected to exceed 500GW by the end of 2005. Currently, the strategic policy of "power transmission from west to east, mutual aid between north and south, and regional networking" is being implemented. However, because the construction of the power grid lags behind the construction of the power supply, the problem of insufficient power transmission capacity has become increasingly prominent, which has exacerbated the contradiction between the development of the power grid and the power supply. line of defense) to prevent the power system from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26G01R31/08
Inventor 宗洪良高亮孙光辉陈松林郑玉平沈国荣
Owner NR ELECTRIC CO LTD
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